How can vinyl silicone oil and silicone hydroxyl terminated silicone rubber be vulcanized together at room temperature?
When the viscosity of vinyl silicone oil is low, the vinyl content is higher, and the cross-linking density is higher, thereby improving the strength of the silicone rubber; as the viscosity of vinyl silicone oil increases, the vinyl content decreases, and the cross-linking density decreases, resulting in silicone rubber. The tensile strength decreases, and the elongation also decreases. Here, the preferred viscosity of vinyl silicone oil is about 5Pa·s

When the amount of vinyl silicone oil is small, the crosslinking density of the vulcanizate is low, and the tensile strength is also poor. However, if there is too much vinyl silicone oil and the crosslinking density is too large, the elasticity of the vulcanizate will become poor, the elongation will decrease, and the tensile strength will also decrease. Therefore, the dosage of vinyl silicone oil is generally 10 parts.

To make the silicone rubber have a certain strength and elongation, the molar mass of 1000-50000 g/mol must be used, and the base compound of vinyl-terminated polysiloxane is suitable.

The use of silicone rubber with a certain amount of vinyl between the molecular chains and both ends can further improve its mechanical strength